97 lines
3.1 KiB
C
97 lines
3.1 KiB
C
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/* scelbi_sys.c: Intel 8008 CPU system interface for the SCELBI computer.
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Copyright (c) 2017, Hans-Ake Lund
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of Hans-Ake Lund shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from Hans-Ake Lund.
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04-Sep-17 HAL Working version of CPU simulator for SCELBI computer
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12-Sep-17 HAL Modules restructured in "Intel-Systems" directory
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*/
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#include "system_defs.h"
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extern DEVICE cpu_dev;
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extern UNIT cpu_unit;
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extern REG cpu_reg[];
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extern DEVICE tty_dev;
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extern DEVICE ptr_dev;
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extern unsigned char Mem[];
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extern int32 saved_PCreg;
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/* SCP data structures
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sim_name simulator name string
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sim_PC pointer to saved PC register descriptor
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sim_emax number of words needed for examine
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sim_devices array of pointers to simulated devices
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sim_stop_messages array of pointers to stop messages
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sim_load binary loader
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*/
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char sim_name[] = "SCELBI";
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REG *sim_PC = &cpu_reg[0];
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int32 sim_emax = 4;
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DEVICE *sim_devices[] = {
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&cpu_dev,
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&tty_dev,
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&ptr_dev,
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NULL
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};
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const char *sim_stop_messages[] = {
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"Unknown error",
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"Unknown I/O Instruction",
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"HALT instruction",
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"Breakpoint",
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"Invalid Opcode"
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};
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/* This is the binary loader. The input file is considered to be
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a string of literal bytes with no format special format. The
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load starts at the current value of the PC.
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*/
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t_stat sim_load (FILE *fileref, CONST char *cptr, CONST char *fnam, int flag)
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{
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int32 i, addr = 0, cnt = 0;
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if (*cptr != 0)
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return SCPE_ARG;
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if (flag != 0) {
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sim_printf ("DUMP command not supported.\n");
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return SCPE_ARG;
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}
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addr = saved_PCreg;
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while ((i = getc (fileref)) != EOF) {
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if (addr >= MAXMEMSIZE)
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return (SCPE_NXM);
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Mem[addr] = i;
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addr++;
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cnt++;
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} /* end while */
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sim_printf ("%d Bytes loaded.\n", cnt);
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return (SCPE_OK);
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}
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